GB603614A - Improvements in or relating to receiver systems for multi-channel electric pulse communication systems - Google Patents
Improvements in or relating to receiver systems for multi-channel electric pulse communication systemsInfo
- Publication number
- GB603614A GB603614A GB28360/45A GB2836045A GB603614A GB 603614 A GB603614 A GB 603614A GB 28360/45 A GB28360/45 A GB 28360/45A GB 2836045 A GB2836045 A GB 2836045A GB 603614 A GB603614 A GB 603614A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- electrodes
- channel
- pulse
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/04—Distributors combined with modulators or demodulators
- H04J3/045—Distributors with CRT
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Particle Accelerators (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
603,614. Thermionic distributers. STANDARD TELEPHONES & CABLES, Ltd. Oct. 26, 1945, No. 28360. Convention date, Nov. 25, 1944. [Class 40 (iii)] [Also in Groups XL (a) and XL (c)] Means are provided, in a receiver for a multichannel train of time-modulated pulses, for separating the pulses of individual channels and for so controlling the separating means by the pulses as simultaneously to demodulate the latter by conversion into amplitude modulated pulses. The means described is a cathoderay tube having a cyclically swept electron beam, under the control of incoming synchronizing signals, and electron responsive means disposed in the sweep path of the beam, and energized for periods depending on the time modulation of the received pulses. In one embodiment, incoming pulses from a radio receiver 10, Fig. 1, are applied to a pulse shaper 35, where their amplitude and duration are made uniform, and then fed to the grid 32 of cathode-ray tube 13, to release the beam during each pulse. Synchronizing pulses of greater width than the channel pulses are selected by pulse-width discriminator 11 and applied to synchronize a sine-wave generator 12 whose output feeds a phase-splitter 14 providing quadrature voltages for application to the deflecting electrodes 18, 19. The circular sweep of the electron beam is arranged to traverse collector electrodes 21 ... 28, and unmodulated pulses switch the beam on so that it overlaps 50 per cent the electrode provided for the appropriate channel. Time modulation varies the overlap period and hence in a proportional manner the amplitude of the resulting pulses in the circuits of the output electrodes. An eight-channel system is illustrated, channel 8 being the synchronizing channel. In the output circuit of each electrode is a low-pass filter 29, for example, and a signal reproducer 30 which are shown fed from electrode 21 corresponding to channel 1. In a second embodiment, Fig. 3 (not shown), the cathode-ray tube is provided with annular deflecting electrodes to which the pulses are applied. In this case, the electron beam is not suppressed between the pulses and is deflected thereby on to the collector electrodes. The synchronizing signal is a tone modulation of one of the channels, the pulses of which are of normal width. A filter tuned to the tone frequency selects the syn. chronizing signal which is used to control a multivibrator which provides a gating pulse for the amplifier feeding the filter and synchronizes the beam-scanning sine wave generator. In a further embodiment, Fig. 4 (not shown), the electron beam falls on a fluorescent screen coated with an opaque mask provided with apertures behind which are arranged selenium cells, energized by light from the screen. The collecting electrodes may be replaced by secondary emitting electrodes 64, Fig. 5, arranged behind apertures 63 in a positively biassed barrier plate 62, the signal output being derived from circuits 65 connected to the secondary-emitting electrodes. Alternatively, the secondary-emitting electrodes may be biassed to cut-off the pulse signals being applied through lead 69 to the barrier plate 62 and the beam being maintained at constant intensity and radius. In this case secondary emission from electrodes 64 occurs for the periods when the beam is in the aperture and the pulse potential is simultaneously applied to electrode 62.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US565152A US2465380A (en) | 1944-11-25 | 1944-11-25 | Cathode-ray tube pulse separation and demodulation system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB603614A true GB603614A (en) | 1948-06-18 |
Family
ID=24257416
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28360/45A Expired GB603614A (en) | 1944-11-25 | 1945-10-26 | Improvements in or relating to receiver systems for multi-channel electric pulse communication systems |
GB25227/46A Expired GB624514A (en) | 1944-11-25 | 1946-08-23 | Improvements in or relating to receivers for multichannel electric pulse communication systems |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB25227/46A Expired GB624514A (en) | 1944-11-25 | 1946-08-23 | Improvements in or relating to receivers for multichannel electric pulse communication systems |
Country Status (6)
Country | Link |
---|---|
US (1) | US2465380A (en) |
BE (2) | BE469039A (en) |
CH (1) | CH261784A (en) |
ES (1) | ES172379A1 (en) |
FR (1) | FR939204A (en) |
GB (2) | GB603614A (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR954961A (en) * | 1945-04-30 | 1950-01-06 | ||
US2533405A (en) * | 1945-09-15 | 1950-12-12 | Nat Union Radio Corp | Demodulation apparatus for pulse multiplex pulse time modulated signals |
US2567203A (en) * | 1946-02-05 | 1951-09-11 | Marcel J E Golay | Multiplex communication system utilizing successive, different pulse modulation techniques |
US2650299A (en) * | 1948-09-22 | 1953-08-25 | Bell Telephone Labor Inc | Decoder for pulse code modulation communication systems |
NL146835B (en) * | 1949-06-04 | Boehringer Mannheim Gmbh | METHOD OF PREPARING A MEDICINAL COMPOUND WITH CORONAR DILATORIC ACTION. | |
US2627587A (en) * | 1950-03-07 | 1953-02-03 | Hans W Kohler | Cathode-ray tube |
US2634380A (en) * | 1950-11-17 | 1953-04-07 | Rca Corp | Cathode-ray tube |
US3063053A (en) * | 1957-03-29 | 1962-11-06 | Sun Oil Co | Seismic recording and reproducing methods, apparatus and records |
US3204107A (en) * | 1961-07-05 | 1965-08-31 | Honeywell Inc | Signal resolution increasing means |
US3388276A (en) * | 1966-12-01 | 1968-06-11 | Raytheon Co | High angular resolution cathode ray tube with sectorlike electrodes having different secondary emission areas |
US3564251A (en) * | 1968-03-04 | 1971-02-16 | Dresser Ind | Casing inspection method and apparatus |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1757345A (en) * | 1930-05-06 | Radio tube | ||
US2189898A (en) * | 1933-08-23 | 1940-02-13 | Bell Telephone Labor Inc | System of communication |
US2057773A (en) * | 1935-12-04 | 1936-10-20 | William G H Finch | Electronic distributor |
US2144337A (en) * | 1936-02-28 | 1939-01-17 | Rca Corp | Electrical device |
US2262838A (en) * | 1937-11-19 | 1941-11-18 | Int Standard Electric Corp | Electric signaling system |
BE433923A (en) * | 1938-04-23 | |||
GB523575A (en) * | 1939-01-06 | 1940-07-17 | Kolster Brandes Ltd | Improvements in or relating to methods of generating pulses characteristic of sound and like waves |
US2250528A (en) * | 1939-02-11 | 1941-07-29 | Bell Telephone Labor Inc | Signal translating system and apparatus |
US2308639A (en) * | 1939-10-06 | 1943-01-19 | Int Standard Electric Corp | Signaling and communication system |
US2405252A (en) * | 1942-07-22 | 1946-08-06 | Rca Corp | Secret communication system |
-
0
- BE BE474803D patent/BE474803A/xx unknown
- BE BE469039D patent/BE469039A/xx unknown
-
1944
- 1944-11-25 US US565152A patent/US2465380A/en not_active Expired - Lifetime
-
1945
- 1945-10-26 GB GB28360/45A patent/GB603614A/en not_active Expired
-
1946
- 1946-01-14 CH CH261784D patent/CH261784A/en unknown
- 1946-01-30 ES ES172379A patent/ES172379A1/en not_active Expired
- 1946-07-19 FR FR939204D patent/FR939204A/en not_active Expired
- 1946-08-23 GB GB25227/46A patent/GB624514A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE474803A (en) | |
BE469039A (en) | |
ES172379A1 (en) | 1946-03-01 |
US2465380A (en) | 1949-03-29 |
GB624514A (en) | 1949-06-10 |
FR939204A (en) | 1948-11-08 |
CH261784A (en) | 1949-05-31 |
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